By Age Group
Cancer incidence data are derived from the Ontario Cancer Registry (OCR) operated by Cancer Care Ontario. The OCR contains information on Ontario residents who have been newly diagnosed with all types of malignant cancers, with the exception of basal cell and squamous cell (non-melanoma) skin cancers. Beginning in 2014, the OCR adopted the National Cancer Institute (NCI) SEER standards for counting multiple primaries for cancer cases diagnosed in 2010 and beyond. This standard is more liberal than the previously used case counting rules from the modified version of the International Association of Cancer Registries (IACR). Cancer data presented on this and other HealthSTATS pages only includes cases captured using the more conservative IACR definition for all years in order to maintain comparability over time. As a result, figures presented on HealthSTATS may be lower than those reported by Cancer Care Ontario as they are using the revised counting methodology.
The rate of new cancer cases (also called the incidence rate) provides a measure of the risk of developing cancer over a given period of time. In 2012 among Simcoe Muskoka residents, there were nearly 500 new cases of lung cancer diagnosed with an age-standardized incidence rate for all ages and both sexes of 84 (76.7, 91.7) per 100,000 population. This was significantly higher than the Ontario lung cancer incidence rate of 72 (70.7, 73.5) per 100,000.
Figure one below shows the trend in lung cancer incidence in both Simcoe Muskoka and Ontario over the twenty-seven year period from 1986 to 2012. The lung cancer incidence rates both in Simcoe Muskoka and Ontario decreased at a small but significant pace over this time period, with an annual percentage decrease of half a per cent per year. The Simcoe Muskoka rate was consistently above the Ontario rate over this twenty-seven year time-period. Figure One
In 2012, the age-standardized incidence rate for lung cancer among Simcoe Muskoka males was 88 (77.0, 100.1) per 100,000, which was not significantly different from the female rate of 82 (72.4, 93.0) per 100,000. The 2012 age-standardized lung cancer incidence rates for Ontario males was not significantly different from rate for Simcoe Muskoka males; however, the Ontario lung cancer incidence rate for females was significantly lower than the comparable Simcoe Muskoka rate.
Figure two shows the trend in lung cancer incidence rates for males and females in Simcoe Muskoka over the twenty-seven year period between 1986 and 2012. The lung cancer incidence rates for males and females in Simcoe Muskoka demonstrated opposite trends over this time period, with male rates declining significantly and female rates increasing significantly. The male lung cancer incidence rates were more than double the females rates in the late 1980’s and early 1990’s and remained significantly higher than the female rates until the mid-2000’s; however, since 2008 the lung cancer incidence rates for males and females in Simcoe Muskoka have not differed significantly. This pattern can be explained by different long-term smoking trends for men and women over the past century, with smoking rates peaking in women in the late 1970’s, nearly 20 years after smoking rates peaked in men.
By Age Group
The risk of being diagnosed with lung cancer increases significantly with age (see figure three). The age-specific lung cancer incidence rates between 2007 and 2012 (combined) in Simcoe Muskoka were highest among those 75 years and older at 407 (380.7, 435.1) new cases per 100,000 population. The age-specific lung cancer incidence rates in Simcoe Muskoka were significantly higher than the comparable provincial rates for adults 45 to 64 years of age and seniors 65 to 74 years of age. Figure Three
The age-specific lung cancer incidence rates for Simcoe Muskoka males and females have demonstrated different patterns over the past quarter of a century. The male lung cancer rates have declined significantly in all age groups for adults 45 years of age and older when comparing the period of time from 1986 to 1991 with the period from 2007 to 2012 (see figure four). Among Simcoe Muskoka females, lung cancer rates have remained the same for adults 45 to 64 years of age across these same time intervals; however, rates have increase significantly among female seniors, particularly for seniors 75 years of age and older (see figure five).